package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {


    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO){
        //判断商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId =  BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果已经存在，将数量加一
        if(list !=null &&list.size() > 0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        }else{
            //如果不存在，需要插入数据
            //判断菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null){
                //菜品 build?
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());



            }else{
                //套餐
                Long setmealId = shoppingCartDTO.getSetmealId();

                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }

            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }



    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart(){
       Long userId =  BaseContext.getCurrentId();
       ShoppingCart shoppingCart = ShoppingCart.builder()
               .userId(userId)
               .build();
       List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
       return list;
    }



    public void clearShoppingCart(){
        Long userId = BaseContext.getCurrentId();

        shoppingCartMapper.clear(userId);

    }

    /**
     * 删除购物车中的一个商品
     * @param shoppingCartDTO
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO){
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //先查询，根据查询数据操作
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);


        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);
            Integer number = shoppingCart.getNumber();
            if(number ==1){
                //直接删除
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else{
                //份数-1
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }

        }
    }
}
